These things are a bit janky to use, you have douse them in flour so they don't stick to the rolled out dough and ruin the shape.
I roll out the dough on wax paper, and after pressing out the cutouts and peeling away the extras, I flip it onto another sheet of wax paper to transfer onto cookie tray. This avoids warping the shape of the cookie.
Infill optional. I printed on PLA but I'm sure any food safe plastic is fine.
Cookie dough recipe I use: https://sweetphi.com/sugar-cut-cookies-actually-hold-shape/